WO2010090293A1

WO2010090293A1 - Opening-closing device

Info

Publication number: WO2010090293A1
Application number: PCT/JP2010/051731
Authority: WO
Inventors: 小松寛; 井藤元暢; 山之内和弘; 長谷川健司; 伊藤岩雄
Original assignee: 日本工営株式会社; 東京都下水道サービス株式会社; 管清工業株式会社
Priority date: 2009-02-04
Filing date: 2010-02-02
Publication date: 2010-08-12
Also published as: US8695628B2; AU2010211675B2; PL2395162T3; AU2010211675A1; CA2751405C; US20110290343A1; MY158647A; KR101357064B1; EP2395162A1; EP2395162B1; JP2010180568A; SG173532A1; CA2751405A1; KR20110116152A; EP2395162A4; JP5166311B2

Abstract

An opening-closing device (1) provided with a gate (10) which can receive the flow of sewage water (W) while in a standing position and fall over in the downstream direction of the flow, and also with a first spring (52a) which generates force for moving the gate (10) to the standing position. When the gate (10) is in a fallen-over position, the first spring (52a) generates force which is not sufficient to move the gate (10) to the standing position, and when the gate (10) is in a tilted position in which the gate (10) is tilted to an angle equal to or less than a predetermined angle, the first spring (52a) generates force which is sufficient to move the gate to the standing position.

Description

Switchgear

The present invention relates to a switchgear used for a flow path such as a sewer.

2. Description of the Related Art Conventionally, an opening / closing device used for a flow path such as a sewer is known (for example, see Patent Document 1 (Japanese Patent Laid-Open No. 2004-300895)). Such an opening / closing device usually clogs the flow path with the valve body closed. Then, garbage accumulates downstream of the flow path. Here, when the water level of the flow path becomes equal to or higher than a predetermined water level due to rain or the like, the valve body is opened, water flows downstream of the flow path, and garbage collected downstream can be washed away. That is, the channel can be cleaned.
It is known that a float is used in order to detect whether or not the water level in the flow path is equal to or higher than a predetermined water level (see, for example, FIG. 1 of Patent Document 1).
In addition, it is known that frame pillars are set up on the left and right sides of the valve body, and the valve body is locked to the left and right frame pillars by a locking mechanism on the left and right frame pillars so that the valve body is not opened (for example, (See FIGS. 5 and 6 of Patent Document 1). In this case, the float and the lock mechanism are interlocked so that when the water level in the flow path becomes equal to or higher than the predetermined water level, the lock by the lock mechanism is released and the valve body is opened. Note that the left and right lock mechanisms are connected to each other because the lock mechanisms provided on the left and right frame columns are simultaneously unlocked.
Further, it is known that when the water level is lowered in a state where the valve body is opened, the valve body is returned to a closed state by the force of a spring (for example, FIG. 1 of Patent Document 1). reference). In this case, the force generated by the spring is increased when the valve body is open.

However, since the force generated by the spring is increased in a state where the valve body is open, the valve body may be closed while the water level of the flow path is still high due to some trigger. .
Then, this invention makes it a subject to prevent a valve body from closing, when the water level of a flow path is high in the state which the valve body opened.
The switchgear according to the present invention includes a gate capable of receiving a fluid flow in a standing state and falling down in a downstream direction of the flow, and a first force generating unit that generates a force for bringing the gate into the standing state. The first force generation unit generates a force that is not sufficient to bring the gate into the standing state when the gate is tilted, and the gate is tilted by a predetermined angle or less. It is configured to generate a force sufficient to bring the gate to the standing state when applied.
According to the switchgear configured as described above, the gate can receive a fluid flow in a standing state and can fall down in the downstream direction of the flow. The first force generation unit generates a force that brings the gate into the standing state. The first force generation unit generates a force that is not sufficient to bring the gate into the standing state when the gate is tilted, and the gate is tilted by a predetermined angle or less. Sufficient force is generated to bring the gate into the standing state.
In the opening / closing apparatus according to the present invention, the gate can be tilted about the gate rotation axis, and one end of the first force generation unit is fixed above the gate rotation axis. The other end of the first force generator is disposed at a position away from the gate rotation axis by a predetermined length, and the one end of the first force generator and the first force generator in a state where the gate is tilted The distance between the straight line connecting the other end of the gate and the rotation center of the gate rotation shaft is such that the one end of the first force generator and the first force are in a state where the gate is tilted by a predetermined angle or less. You may make it shorter than the distance of the straight line which tied the other end of the generation | occurrence | production part, and the rotation center of the said gate rotating shaft.
In the opening / closing apparatus according to the present invention, the first force generation unit may have a spring fixed to one end of the first force generation unit.
In the opening / closing apparatus according to the present invention, the first force generation unit may include a link fixed to the other end of the first force generation unit and connected to the spring.
The switchgear according to the present invention has a force sufficient to start the gate in the standing state when the gate is tilted and the water level of the flow path through which the fluid flows is equal to or lower than a predetermined water level. You may make it provide the 2nd force generation | occurrence | production part which generate | occur | produces.
In the opening / closing apparatus according to the present invention, the gate can be tilted about the gate rotation axis, and one end of the second force generation unit is fixed above the gate rotation axis. The other end of the second force generator may be disposed at a position separated from the gate rotation axis by a predetermined length.
In the opening / closing apparatus according to the present invention, the second force generation unit includes a spring fixed to one or both of one end of the second force generation unit and the other end of the second force generation unit. Also good.
In the opening / closing apparatus according to the present invention, one end of the first force generation unit is fixed above the gate rotation shaft, and the other end of the first force generation unit has a predetermined length from the gate rotation shaft. A straight line connecting one end of the second force generation unit and the other end of the second force generation unit in a state where the gate is tilted, and a rotation center of the gate rotation shaft. The distance is longer than the distance between the straight line connecting one end of the first force generation unit and the other end of the first force generation unit and the rotation center of the gate rotation shaft in a state where the gate is tilted. It may be.
In the opening / closing apparatus according to the present invention, the spring constant of the spring included in the first force generation unit may be larger than the spring constant of the spring included in the second force generation unit.

FIG. 1 is a diagram for explaining the outline of the operation when the switchgear 1 according to the embodiment of the present invention is provided in the

sewers

100U, 100L, and is a diagram when the water level of the sewer 100U is low (FIG. 1 (a )), A view when the water level of the sewer 100U is becoming higher (FIG. 1 (b)), and a view after the water level of the sewer 100U is higher than a predetermined height (FIG. 1 (c)). .
FIG. 2 is a perspective view of the opening / closing device 1 (a state where the gate 10 is standing).
FIG. 3 is a perspective view of the opening / closing device 1 (a state in which the gate 10 is tilted).
FIG. 4 is a view of the opening / closing device 1 as viewed from the upstream side (FIG. 4A) and a view as viewed from the downstream side (FIG. 4B).
FIG. 5 is a side view of the opening / closing device 1, which is a left side view (FIG. 5 (a)) and a right side view (FIG. 5 (b)) as viewed from the upstream side.
FIG. 6 is an enlarged front view of the vicinity of the floating prevention portion 44 of the opening / closing device 1.
FIG. 7 is a plan view seen through the vicinity of the

fall prevention portions

20a and 20b in a state where the gate 10 is standing.
FIG. 8 is a right side view of the switchgear 1 when viewed from the upstream side when the water level of the sewage W is low (indicated as W.L.) FIG. 9 is the water level of the sewage W (W.L.). Is a right side view of the opening / closing device 1 when the second float 16 is positioned substantially above the water level of the sewage W.
FIG. 10 is a right side view of the opening / closing device 1 when the water level of the sewage W (indicated as W.L.) becomes higher and the second float 16 floats.
FIG. 11 is an enlarged front view of the vicinity of the floating prevention portion 44 of the opening / closing device 1 when the floating prevention portion 44 rotates.
FIG. 12 is a plan view of the vicinity of the

fall prevention portions

20a and 20b in a state where the gate 10 has fallen.
FIG. 13 is a view of the opening / closing device 1 as viewed from the downstream side, seeing through the common rotation shaft 28, and further, a first release operation part (rotation part 29b and descending part 24b) and a second release operation part (rotation). The portion 29a and the descending portion 24a), the

fall prevention portions

20b and 20a, the first support release portion 22b, and the second support release portion 22a are illustrated.
FIG. 14 is a right side view of the opening / closing device 1 after the sewage W has flowed downstream.
FIG. 15 is a side view of the opening / closing device 1 when the gate 10 falls down, and is a left side view (FIG. 15 (a)) and a right side view (FIG. 15 (b)) as viewed from the upstream side. is there.
FIG. 16 is a side view of the opening / closing device 1 when the gate 10 is slightly raised, as viewed from the upstream side (FIG. 16 (a)), right side view (FIG. 16 (b)). It is.
FIG. 17 is a side view of the opening / closing device 1 when the gate 10 is further raised, and is a left side view (FIG. 17 (a)) and a right side view (FIG. 17 (b)) as viewed from the upstream side. It is.
FIG. 18 is a side view of the switchgear 1 in a state where the gate 10 stands, and is a left side view (FIG. 18 (a)) and a right side view (FIG. 18 (b)) as viewed from the upstream side. is there.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram for explaining the outline of the operation when the switchgear 1 according to the embodiment of the present invention is provided in the

sewers

100U, 100L, and is a diagram when the water level of the sewer 100U is low (FIG. 1 (a )), A view when the water level of the sewer 100U is becoming higher (FIG. 1 (b)), and a view after the water level of the sewer 100U is higher than a predetermined height (FIG. 1 (c)). . Although the gate 10 of the switchgear 1 is shown, other components of the switchgear 1 are not shown in FIG.
First, the sewer 100U is on the upstream side, and the sewer 100L side is on the downstream side. The switchgear 1 is disposed between the sewer 100U and the sewer 100L through a manhole (not shown). Usually, the water level of the sewage W flowing through the sewer 100U is low (see FIG. 1 (a)). At this time, the gate 10 stands and receives a flow of sewage W (a kind of fluid) flowing through the sewer 100U. Then, the sewage W is stopped by the gate 10, and the sewage W does not flow into the downstream sewer 100L. Then, garbage G accumulates in the sewer 100L.
Here, the water level of the sewage W flowing through the sewer 100U rises due to rain or the like (see FIG. 1 (b)). Then, when the water level of the sewer 100U becomes equal to or higher than a predetermined height (see FIG. 1 (b)), the gate 10 falls and the sewer W flows from the sewer 100U to the sewer 100L. Thereby, the garbage G accumulated in the sewer 100L flows away, and the sewer 100L can be washed.
FIG. 2 is a perspective view of the opening / closing device 1 (a state where the gate 10 is standing). FIG. 3 is a perspective view of the opening / closing device 1 (a state in which the gate 10 is tilted). FIG. 4 is a view of the opening / closing device 1 as viewed from the upstream side (FIG. 4A) and a view as viewed from the downstream side (FIG. 4B).
The switchgear 1 includes a gate 10,

frame columns

12a and 12b, a bottom 12c, a plate 14, a first float 18, a second float 16, a float support 30, a lower fulcrum 32, a lower float insert 34L, and an upper float insert 34U. The upper fulcrum 36, the suspension member 38, the suspension fulcrum 40, and the plate 50 are provided.
The gate 10 is surrounded by

frame pillars

12 a and 12 b standing on the side of the gate 10 and a bottom portion 12 c disposed at the bottom of the gate 10, and is further partially covered by a plate 14. When the gate 10 is standing, it receives the water flow and is coughing (see FIG. 2). However, when the water level of the water flow increases and the first float 18 and the second float 16 rise, the gate 10 falls to the downstream side, and fluid such as sewage W flows downstream (see FIG. 3).
In FIGS. 2 and 3, the left side is the upstream side and the right side is the downstream side. The specific gravity of the first float 18 and the second float 16 is smaller than the specific gravity of the fluid received with the gate 10 standing. In addition, the first float 18 and the second float 16 are arranged on the upstream side of the gate 10. Further, the second float 16 is disposed above the first float 18.
In addition, the float support 30 is arrange | positioned below the 1st float 18, and is being fixed to the frame pillar 12b. A lower float insert 34 </ b> L is fixed to the lower fulcrum 32 of the float support 30. The lower float insert 34L extends in the vertical direction and is inserted into the first float 18 from below. The first float 18 can move up and down along the lower float insert 34L. The upper float insert 34U penetrates the second float 16 and is inserted into the first float 18 from above. The suspension member 38 is a member that suspends the first float 18 with the upper float insertion body 34U fixed to the upper fulcrum 36 thereof. The suspension member 38 is fixed to the frame column 12b by a suspension fulcrum 40. When the first float 18 does not float, the upper float insert 34U does not rise, and the suspension member 38 remains horizontal (see FIGS. 8 and 9). When the first float 18 rises, the upper float insert 34U also rises, and the suspension member 38 rotates about the suspension fulcrum 40 so that the upper fulcrum 36 rises (see, for example, FIG. 10).
The floating prevention unit 44 shown in FIG. 4 (a) will be described later with reference to FIG. 5 and FIG.
The plate 50 is fixed to the upper part of the frame column 12b.
FIG. 5 is a side view of the opening / closing device 1, which is a left side view (FIG. 5 (a)) and a right side view (FIG. 5 (b)) as viewed from the upstream side. FIG. 6 is an enlarged front view of the vicinity of the floating prevention portion 44 of the opening / closing device 1. FIG. 7 is a plan view seen through the vicinity of the

fall prevention portions

20a and 20b in a state where the gate 10 is standing.
In addition to what has been described so far, the switchgear 1 includes the

fall prevention parts

20b, 20a, the first support release part 22b, the second support release part 22a, the floating prevention part 44, the second float support beam 41, and the floating prevention release part. 42, gate rotating shaft 26, common rotating shaft 28, rotating

portions

29b and 29a, descending

portions

24b and 24a, first spring 52a, second spring (second force generating portion) 52b, link 54, rotating

bodies

56a and 56b. Prepare.
The gate 10 can be tilted about a hollow gate rotation shaft 26 (see FIG. 13) as a rotation center (rotation shaft). Note that the gate 10 in a collapsed state is shown by a dotted line in FIG.
Referring to FIG. 7, the

fall prevention portions

20 b and 20 a are in contact with the downstream surface 10 a and apply a force against the water flow to the gate 10. In other words, the

fall prevention portions

20 b and 20 a support the downstream surface 10 a of the gate 10. The

fall prevention units

20b and 20a support the gate 10 to prevent the gate 10 from falling to the downstream side. When viewed from the upstream side, the fall prevention unit 20b is arranged on the right side, and the fall prevention unit 20a is arranged on the left side.
Referring to FIG. 7, first support release portion 22b and second support release portion 22a are bilaterally symmetric when viewed from the upstream side (even when viewed from the downstream side).
The first support release portion 22b pulls the fall prevention portion 20b to the outside (right side in FIG. 7) of the water flow (flow), thereby removing the point where the fall prevention portion 20b contacts the gate 10 from the gate 10 to prevent the fall. The support of the gate 10 by the portion 20b is released (see FIG. 12).
The second support release part 22a pulls the fall prevention part 20a to the outside of the water flow (flow) (left side in FIG. 7), thereby removing the point where the fall prevention part 20a contacts the gate 10 from the gate 10 to prevent the fall. The support of the gate 10 by the part 20a is released (see FIG. 12).
In FIG. 5A, for the sake of convenience of illustration, the anti-lifting release portion 42, the anti-lifting portion 44, and the plate 50 are not shown. Further, in FIG. 5 (a), the link 58 (shown in FIG. 15 (a)) is also omitted, and the first spring 52 is shown fixed to the rotating portion 56a.
The floating prevention unit 44 prevents the first float 18 from floating.
Referring to FIG. 6, the levitation preventing portion 44 has a collision portion 44b, a fixed portion 44a, and a rotatable portion 44c.
The collision portion 44b is positioned above the suspension member 38 and collides with the suspension member 38 when the portion where the suspension member 38 rises (the portion of the suspension member 38 that is directly below the collision portion 44b) rises. If the 1st float 18 floats, the part to which the suspension member 38 will raise will also raise. However, since the suspension member 38 collides with the collision portion 44b, the first float 18 cannot be lifted.
The fixing portion 44a fixes the collision portion 44b to a portion that is stationary with respect to the flow (for example, the plate 50). The collision portion 44b can rotate around the fixed portion 44a. Note that the fixed portion 44a is fixed to the plate 50 in other drawings.
The rotatable portion 44c is located at the same height as the fixed portion 44a and is rotatable about the fixed portion 44a.
The collision portion 44b and the rotatable portion 44c are integrated, and the collision portion 44b also rotates around the fixed portion 44a by the angle at which the rotatable portion 44c rotates around the fixed portion 44a.
The second float support beam 41 is fixed to the frame column 12b at a fulcrum 41a (see FIG. 8) and supports the second float 16. The second float support beam 41 is rotatable around a fulcrum 41a.
The levitation prevention release part (drive part) 42 is rotatably connected to a connection point 41b (arranged upstream of the fulcrum 41a) of the second float support beam 41 (see FIG. 8). When the second float 16 rises, the second float support beam 41 rotates about the fulcrum 41a, and the connection point 41b rises. Then, the anti-lifting release unit (driving unit) 42 moves up and pushes the rotatable portion 44c upward, and the rotatable portion 44c rotates around the fixed portion 44a. Then, the collision portion 44b moves from above the suspension member 38 (see FIG. 11), and there is no obstacle that prevents the suspension member 38 from being lifted immediately below the collision portion 44b. In this way, the floating prevention release unit (drive unit) 42 releases the floating prevention of the first float 18 by the floating prevention unit 44 as the second float 16 floats.
Referring to FIG. 13, the common rotating shaft 28 is disposed inside the hollow gate rotating shaft 26 and extends in the same direction as the gate rotating shaft 26.
The rotating

portions

29 b and 29 a are fixed to the common rotating shaft 28 and rotate together with the common rotating shaft 28. For example, when the rotating unit 29b rotates, the common rotating shaft 28 rotates with the rotation. When the common rotating shaft 28 rotates, the rotating unit 29a rotates.
One end 54a of the link 54 is connected to the suspension member 38, and the vicinity 54b of the other end is connected to the rotating portion 29b.
The descending portion 24b is fixed so as to be able to rotate at the end of the rotating portion 29b (on the opposite side to the vicinity 54b of the other end). When the rotating portion 29b rotates clockwise in FIG. 5 (b), the descending portion 24b descends accordingly.
The descending portion 24b is connected to the suspension member 38 via the link 54 and the rotating portion 29b. As the part where the hanging member 38 rises (the part of the hanging member 38 directly below the collision part 44b) rises, the rotating part 29b rotates clockwise in FIG. 5 (b), and the descending part 24b Descend.
The descending portion 24a is fixed to the end of the rotating portion 29a so as to be rotatable. When the rotating portion 29a rotates counterclockwise in FIG. 5 (a) (corresponding to the clockwise rotation in FIG. 5 (b)), the descending portion 24a descends accordingly.
The rotating part 29b and the descending part 24b constitute a first release operating part. The first release actuating part lowers the descending part 24b and pulls the first support releasing part 22b while rotating the common rotating shaft 28 by the rotating part 29b (clockwise rotation in FIG. 5 (b)). Thus, the first support release portion 22b is operated.
Referring to FIG. 13, the first support release portion 22b has a shape bent substantially at a right angle, the horizontal portion is connected to the descending portion 24b, and the portion extending in the vertical direction becomes the fall preventing portion 20b. It can be connected and rotated around a bent part at a right angle.
Therefore, when the lowering portion 24b is lowered and the first support release portion 22b is pulled, the first support release portion 22b rotates counterclockwise in FIG. 13 and pulls the fall prevention portion 20b. The part 22b will operate.
The rotating portion 29a and the descending portion 24a constitute a second release operating portion. The second release actuating part rotates the rotating part 29a with the rotation of the common rotating shaft 28 (counterclockwise rotation in FIG. 5 (a)), lowers the descending part 24a, and the second support releasing part 22a. By pulling, the second support release portion 22a is operated.
Referring to FIG. 13, the second support releasing portion 22a has a shape bent substantially at a right angle, the horizontal portion is connected to the descending portion 24a, and the portion extending in the vertical direction becomes the fall preventing portion 20a. It can be connected and rotated around a bent part at a right angle.
Therefore, when the lowering portion 24a is lowered and the second support release portion 22a is pulled, the second support release portion 22a rotates clockwise in FIG. 13 and pulls the fall prevention portion 20a. 22a will operate.
The first release operation part (rotating part 29b and descending part 24b) and the second release action part (rotating part 29a and descending part 24a) are bilaterally symmetric when viewed from the upstream side (even when viewed from the downstream side). is there.
The first spring 52a, the second spring (second force generator) 52b, and the

rotating bodies

56a and 56b will be described later with reference to FIG.
Next, the operation of the embodiment of the present invention (from the low water level to the high water level until the gate 10 falls) will be described.
Usually, the water level of the sewage W is low.
FIG. 8 is a right side view of the switchgear 1 when viewed from the upstream side when the water level of the sewage W (indicated as W.L.) is low. Referring to FIG. 8, when the water level of sewage W (indicated as W.L.) is low, it is as described with reference to FIGS. 5 (a) and 5 (b), and gate 10 falls over preventing part 20b. , 20a and remain standing.
Here, the water level of the sewage W becomes higher due to rain or the like.
In FIG. 9, the water level of the sewage W (indicated as WL) is high and exceeds the upper end of the first float 18, but the second float 16 is located substantially above the water level of the sewage W. It is a right view of the switchgear 1 in the case. In FIG. 9, the descending portion 24b is not shown.
Since the first float 18 is submerged in the sewage W, and the specific gravity of the first float 18 is smaller than the specific gravity of the sewage W, the first float 18 originally floats and the upper end of the first float 18 is the sewage W. Should exceed the water level. However, the first float 18 does not rise.
When the first float 18 rises, the upper float insert 34U also rises, and the suspension member 38 rotates about the suspension fulcrum 40 so that the upper fulcrum 36 rises (clockwise in FIG. 9). To do. However, referring to FIG. 6, the collision portion 44 b is located above the suspension member 38. For this reason, even if it tries to rotate around the suspending fulcrum 40 of the suspending member 38, the suspending member 38 collides with the collision part 44b and cannot be rotated any more. Therefore, the rotation of the suspending member 38 is prevented. As a result, the first float 18 does not rise.
Furthermore, the water level of the sewage W becomes higher.
FIG. 10 is a right side view of the opening / closing device 1 when the water level of the sewage W (indicated as W.L.) becomes higher and the second float 16 floats. In FIG. 10, the gate rotation shaft 26 is not shown.
The second float 16 is made of the same material as the first float 18 and has the same outer diameter at the bottom. However, the second float 16 is thinner in the vertical direction than the first float 18. Therefore, the second float 16 is lighter than the first float 18. This means that when the second float 16 is partially submerged in the sewage W, it is likely to rise rapidly.
FIG. 11 is an enlarged front view of the vicinity of the floating prevention portion 44 of the opening / closing device 1 when the floating prevention portion 44 rotates.
When the second float 16 is partially submerged in the sewage W and rapidly rises, the second float support beam 41 rotates around the fulcrum 41a and the connection point 41b rises. Then, the anti-lifting release unit (driving unit) 42 moves up and pushes the rotatable portion 44c upward, and the rotatable portion 44c rotates around the fixed portion 44a. Then, the collision portion 44b moves from above the suspension member 38 (see FIG. 11), and there is no obstacle that prevents the suspension member 38 from being lifted immediately below the collision portion 44b.
Here, since the first float 18 is completely submerged in the sewage W and receives a large buoyancy, the first float 18 tends to rise rapidly. As a result, the suspension member 38 rotates around the suspension fulcrum 40 (clockwise in FIG. 10).
Then, the link 54 rises, and the rotating portion 29b lowers the descending portion 24b while rotating the common rotating shaft 28 (clockwise in FIG. 10). When the lowering portion 24b is lowered and the first support release portion 22b is pulled, the first support release portion 22b rotates counterclockwise in FIG. 13 and pulls the fall prevention portion 20b. Therefore, the first support release portion 22b Operates. Therefore, the fall prevention unit 20b is detached from the gate 10 (see FIG. 12).
FIG. 13 is a view of the opening / closing device 1 as viewed from the downstream side, seeing through the common rotation shaft 28, and further, a first release operation part (rotation part 29b and descending part 24b) and a second release operation part (rotation). The portion 29a and the descending portion 24a), the

fall prevention portions

20b and 20a, the first support release portion 22b, and the second support release portion 22a are illustrated.
When the common rotating shaft 28 rotates (clockwise in FIG. 10), the common rotating shaft 28 rotates counterclockwise in FIG. 5 (a), and the descending portion 24a descends to provide the second support. When the release portion 22a is pulled and the second support release portion 22a rotates clockwise in FIG. 13 to pull the fall prevention portion 20a, the second support release portion 22a operates. Therefore, the fall prevention unit 20a is detached from the gate 10 (see FIG. 12).
As described above, the first support release portion is associated with the floating of the first float 18 (in addition, “floating” does not necessarily require the upper end to be exposed to the water surface, and includes that the upper end moves toward the water surface). 22b and the second support release part 22a operate.
FIG. 12 is a plan view of the vicinity of the

fall prevention portions

20a and 20b in a state where the gate 10 has fallen. Since the

fall prevention parts

20a and 20b are detached from the gate 10, the gate 10 falls down downstream due to the water pressure of the sewage W.
FIG. 14 is a right side view of the opening / closing device 1 after the sewage W has flowed downstream. If the water level becomes lower than the lower end of the second float 16 due to the sewage W flowing downstream, the first float 18 descends while floating on the surface of the sewage W. Thereby, the suspension member 38 also returns to the horizontal. In addition, the second float 16 is lowered, the connection point 41b is also lowered, and the floating prevention portion 44 is also returned to the position where the suspension member 38 is held down (see FIG. 6).
According to the embodiment of the present invention, even if the first float 18 is submerged in the sewage W, the levitation preventing portion 44 holds down the suspension member 38 until the second float 16 rises (FIG. 6). See), the first float 18 cannot rise.
Here, when the second float 16 suddenly rises, the rise prevention unit 44 rotates accordingly, and the suspension member 38 cannot be restrained (see FIG. 11), and the first float 18 starts to rise suddenly. (It has already been submerged and large buoyancy is acting on the first float 18). As a result, the fulcrum 40 rotates about the fulcrum 40 of the suspension member 38 in the clockwise direction in FIG. 10 and the link 54 rises, so that the rotating portion 29b rotates clockwise, and the descending portion 24b descends. The support release portion 22b is pulled (see FIG. 13), the fall prevention portion 20b is pulled, and the support of the gate 10 is released.
Moreover, as the rotating portion 29b rotates clockwise in FIG. 10, the common rotating shaft 28 rotates, the rotating portion 29a rotates (counterclockwise in FIG. 5A), and the descending portion 24a descends. Then, the second support release portion 22a is pulled (see FIG. 13), the fall prevention portion 20a is pulled, and the support of the gate 10 is released. In principle, it is beneficial that the operation is transmitted by pulling so that the support of the gate 10 is released simultaneously by the

fall prevention units

20a and 20b.
Here, since the first float 18 rises abruptly, the support of the gate 10 by the fall prevention portion 20b is also suddenly released, so that the gate 10 can be quickly fallen down and opened.
In addition, the

fall prevention portions

20a and 20b are connected by the common rotary shaft 28, and the common rotary shaft 28 enters the hollow gate rotary shaft 26, and the sewage W is inside the gate rotary shaft 26. Since it does not enter, the common rotating shaft 28 is not exposed to the sewage W.
Moreover, the opening / closing device 1 according to the embodiment of the present invention returns to the state where the gate 10 stands when the water level of the flow path becomes low because the gate 10 falls down.
FIG. 15 is a side view of the opening / closing device 1 when the gate 10 falls down, and is a left side view (FIG. 15 (a)) and a right side view (FIG. 15 (b)) as viewed from the upstream side. is there. As described above, the opening / closing device 1 includes the first spring 52a, the second spring (second force generating unit) 52b, the link 54, and the

rotating bodies

56a and 56b. Further, the opening / closing device 1 has a link 58.
The

rotators

56 a and 56 b are fixed to the gate rotation shaft 26 and rotate together with the gate rotation shaft 26.
The first force generator is configured by a first spring 52 a and a link 58. The first spring 52a is fixed to one end 52a-1 of the first force generator. The link 58 is fixed to the other end 58a of the first force generator and is connected to the first spring 52a.
One end 52 a-1 of the first force generator is fixed above the gate rotation shaft 26. The other end 58a of the first force generating unit is fixed to the rotating body 56a and the other end 58a of the first force generating unit is disposed at a position separated from the gate rotation shaft 26 (the center) by a predetermined length. ing. That is, even if the rotating body 56a rotates together with the gate rotation shaft 26, the distance (predetermined length) between the other end 58a of the first force generator and the gate rotation shaft 26 (the center thereof) does not change.
The first spring 52a generates a force that returns the gate 10 to a standing state. However, the first spring 52a generates a force that is not sufficient to bring the gate 10 into a standing state when the gate 10 is tilted. Referring to FIG. 15A, a straight line connecting one end 52a-1 of the first force generating portion and the other end 58a of the first force generating portion in a state where the gate 10 is tilted, and the gate rotating shaft 26 Distance D1 (corresponding to the length of a perpendicular line extending from the center of the gate rotation shaft 26 to the straight line connecting the one end 52a-1 and the other end 58a). Therefore, the torque for rotating the gate rotation shaft 26 clockwise in FIG. 15 (a) is small, and the force is not sufficient to bring the gate 10 into the standing state.
The second force generator has a second spring 52b fixed to both one end 52b-1 of the second force generator and the other end 52b-2 of the second force generator. However, the second spring 52b is fixed to one end 52b-1 (or the other end 52b-2), the link is connected to the other end 52b-2 (or one end 52b-1), and the second spring 52b is connected to the link. It is also conceivable to do so.
One end 52 b-1 of the second force generator is fixed above the gate rotation shaft 26. The other end 52b-2 of the second force generation unit is fixed to the rotating body 56b, and is disposed at a position separated from the gate rotation shaft 26 (the center) by a predetermined length. That is, even if the rotating body 56b rotates together with the gate rotation shaft 26, the distance (predetermined length) between the other end 52b-2 of the second force generation unit and the gate rotation shaft 26 (the center) does not change.
Note that a distance D2 between a straight line connecting one end 52b-1 of the second force generation unit and the other end 52b-2 of the second force generation unit and the rotation center of the gate rotation shaft 26 in a state where the gate 10 is tilted. (Corresponding to the length of a perpendicular line drawn from the center of the gate rotation shaft 26 to the straight line connecting the one end 52b-1 and the other end 52b-2) is longer than the distance D1. However, the second spring 52b is longer than the first spring 52a (the spring constant is small), and the torque to rotate counterclockwise in FIG. 15 (b) is small.
By adjusting the distance D2 and the length by which the second spring 52b is contracted, when the water level of the flow path through which the fluid (sewage W) flows is equal to or lower than the predetermined water level, the gate 10 starts to stand. To generate sufficient force. However, the force of the second spring 52b is increased too much so that sufficient force is not generated to start the gate 10 standing while the water level in the flow path is still high.
Then, when the water level becomes equal to or lower than the predetermined water level, the gate rotation shaft 26 is rotated by the contraction force of the second spring 52b, and the gate 10 is slightly raised.
FIG. 16 is a side view of the opening / closing device 1 when the gate 10 is slightly raised, as viewed from the upstream side (FIG. 16 (a)), right side view (FIG. 16 (b)). It is.
Referring to FIG. 16 (a), a straight line connecting one end 52a-1 of the first force generating portion and the other end 58a of the first force generating portion when the gate 10 is slightly raised, and the gate rotating shaft 26 The distance from the center is still short. Therefore, the torque generated by the first spring 52a for rotating the gate rotation shaft 26 clockwise (torque for raising the gate 10) is still small.
Referring to FIG. 16 (b), a straight line connecting one end 52b-1 of the second force generating portion and the other end 52b-2 of the second force generating portion when the gate 10 is slightly raised, and gate rotation The distance from the center of the shaft 26 is still long. Therefore, the torque (torque for raising the gate 10) for rotating the gate rotation shaft 26 counterclockwise generated by the second spring 52b is still sufficient for raising the gate 10.
Furthermore, the gate 10 goes up.
FIG. 17 is a side view of the opening / closing device 1 when the gate 10 is further raised, and is a left side view (FIG. 17 (a)) and a right side view (FIG. 17 (b)) as viewed from the upstream side. It is.
Referring to FIG. 17 (a), a straight line connecting one end 52a-1 of the first force generating portion and the other end 58a of the first force generating portion when the gate 10 is tilted by a predetermined angle. The distance D3 from the center of the gate rotation shaft 26 is long. That is, in a state where the gate 10 is tilted (see FIG. 15 (a)), the straight line connecting the one end 52a-1 of the first force generating unit and the other end 58a of the first force generating unit, and the gate rotation shaft 26 The distance D1 from the center of is shorter than the distance D3. The same applies to the case of tilting less than a predetermined angle (when the gate 10 is standing more than in FIG. 17A). Therefore, when the gate 10 is tilted by a predetermined angle or less, the first spring 52a generates a force sufficient to bring the gate 10 into a standing state. That is, the torque for rotating the gate rotation shaft 26 generated by the first spring 52a clockwise (torque for raising the gate 10) is sufficiently large to make the gate 10 stand.
Referring to FIG. 17 (b), a straight line connecting one end 52b-1 of the second force generating portion and the other end 52b-2 of the second force generating portion when the gate 10 is further raised, and gate rotation The distance from the center of the shaft 26 is slightly shortened. Therefore, the torque generated by the second spring 52b for rotating the gate rotation shaft 26 counterclockwise (torque for raising the gate 10) is slightly reduced.
Finally, the gate 10 is returned to the standing state.
FIG. 18 is a side view of the switchgear 1 in a state where the gate 10 stands, and is a left side view (FIG. 18 (a)) and a right side view (FIG. 18 (b)) as viewed from the upstream side. is there.
Referring to FIG. 18 (a), the torque for rotating the gate rotation shaft 26 generated by the first spring 52a clockwise is large.
Referring to FIG. 18 (b), there is a gate rotation shaft 26 on a straight line connecting one end 52b-1 of the second force generating portion and the other end 52b-2 of the second force generating portion. The torque generated by the spring 52b for rotating the gate rotation shaft 26 counterclockwise is substantially zero.
According to the embodiment of the present invention, when the gate 10 falls (see FIG. 15 (a)), the torque for bringing the gate 10 upright caused by the first spring 52a having a large spring constant is small. It is possible to prevent the gate 10 from closing while the water level of the flow path is high.
In addition, when the gate 10 is tilted by a predetermined angle or less (see FIG. 17A), the first spring 52a generates a force sufficient to bring the gate 10 into a standing state. Therefore, the gate 10 can be made to stand.
Furthermore, when the gate 10 falls down (see FIG. 15 (b)), when the water level of the flow path through which the fluid (sewage W) flows is below a predetermined water level, the gate 10 starts to stand. The gate 10 can be started to stand by the second spring 52b that generates a sufficient force.

Claims

A gate capable of receiving a fluid flow in a standing state and falling down in the downstream direction of the flow;
A first force generator for generating a force to bring the gate into the standing state;
With
The first force generator is
In the state where the gate falls, it generates a force that is not sufficient to bring the gate into the standing state,
Generating sufficient force to bring the gate into the standing position with the gate leaning down by a predetermined angle or less;
Switchgear.
The switchgear according to claim 1,
The gate can be tilted about the rotation axis of the gate,
One end of the first force generator is fixed above the gate rotation axis,
The other end of the first force generation unit is disposed at a position away from the gate rotation axis by a predetermined length,
The distance between the straight line connecting one end of the first force generation unit and the other end of the first force generation unit and the rotation center of the gate rotation shaft in a state where the gate is tilted,
A distance between a straight line connecting one end of the first force generation unit and the other end of the first force generation unit and a rotation center of the gate rotation shaft in a state where the gate is tilted by a predetermined angle or less. Shorter than,
Switchgear.
The switchgear according to claim 2, wherein
The opening / closing apparatus in which the first force generation unit includes a spring fixed to one end of the first force generation unit.
The switchgear according to claim 3, wherein
The first force generator is
A link fixed to the other end of the first force generator and connected to the spring;
Opening and closing device.
The switchgear according to claim 1,
A second force generator that generates a sufficient force to start the gate in the standing state when the water level of the flow path through which the fluid flows is equal to or lower than a predetermined water level when the gate is tilted;
Opening and closing device provided with.
The switchgear according to claim 5,
The gate can be tilted about the rotation axis of the gate,
One end of the second force generation unit is fixed above the gate rotation axis,
The other end of the second force generator is disposed at a position away from the gate rotation axis by a predetermined length.
Switchgear.
The switchgear according to claim 6, wherein
An opening / closing device in which the second force generation unit includes a spring fixed to one or both of one end of the second force generation unit and the other end of the second force generation unit.
The switchgear according to claim 7, wherein
One end of the first force generator is fixed above the gate rotation axis,
The other end of the first force generation unit is disposed at a position away from the gate rotation axis by a predetermined length,
The distance between the straight line connecting one end of the second force generation unit and the other end of the second force generation unit in the state where the gate is tilted, and the rotation center of the gate rotation axis is
In a state where the gate is tilted, it is longer than a distance between a straight line connecting one end of the first force generation unit and the other end of the first force generation unit, and a rotation center of the gate rotation shaft,
Switchgear.
The switchgear according to claim 5,
The spring constant of the spring that the first force generation unit has is larger than the spring constant of the spring that the second force generation unit has,
Switchgear.